Benoist p



B. P. GILMAN.

DRIFT VALVE.

APPLICATION FILED mm. 1.191s.

Patented Jan. 3, 1922.

3 SHEETS-SHEET 1.

B. P. GILMAN DRIFT VALVE.

APPLICATION FILED MAR. 1. i918.

Patented Jan. 3, 1922.

3 SHEETS-S [ET 2- enamel;

B. P. GILMAN.

DRIFT VALVE;

APPLICATION FILED MAR. .1918.

1,401,975. Patented an-3, 2.

3 SHEE HEE INVENTOR ni iiieatimfil ii March 1,

P." GimriiN, a j

.ij fcitizen of ithe-PUnited" States, residing at Yoakum, inthe county of LavacaandjjState inv 'ntion relat provements in Drift lVa lve's of Texas, haveinvented new ari d us'e'fnl Imdrift valves for locomotive engines and the main "ob j ect of "will effect an automatic dlv'ersi'o'ni of'the" theinventionlis to produce a 'v alve which Specification of Letters Patent.

nmois'rr. elit sm, or YOAKUM, TEXAS.

iiitim VALV atented J an 3, 1 922. 191 8f Seria1 mi 219,911Q 2 ring 7 being located abont centrallyofthe body 1 and the ring'jdbein glocatedfadia cent to. the opposite end' of theibodyffrom the piston headi2." I I 1 H J The; valve casing. B com chamber 8 inwh'ich is arranged a bushing 9 which surrounds thebody l of the valve and said bushing 9 is'fformed with two series receive 'split expansion ring-s candle," the of ports 11 corresponding in shape and in all other respectsfwith the ports 5 of the exh ailst steam from-the: air pump: of the Valve b dy." To prevent relative rotationlbe- "como t-ive fromthe normal outlet to. the stack 1 01 smoke box, into the steam chests oi the sin ii f i imp using ;s t.eam"as in" descending grades.

steaiii cylindersyafter the steam-from the The exhaust steam containing oil from the cation for thefcylinders' andpistons. I WVith the aboveaneo i q sm ai v e is af detail vi K air;them delivered into "the ste am"'-with an extension 13"having an annular ref'chests through the operationof. the Clllftll lg 1 valve,'thus furnishing the "necessary lubri-"f the invention consists in the 'novel'construcj tion, combination and arrangement ofparts,"

' herein" liege-rate, illustrated claimed. v

the arming v lve.

Figure 4 s a ;vievv'oflthefsteain chest? diagrammatic view I of the i Figure 6 is a vievv shovvii g the invention n se upon a locomotix' e. p I Referrlng to the drawlngs, A designates:

l lthe"dri'fting valve proper and B the casing E in which said'valve is mounted forreciprocator'yf'movement. The valveA comprises a -tnbular or's'leeve-like body 1; and has atj one end thereof, an enlargedipiston head 2,1

the latter fhavingf expansion rings. 3 of the "which the'steam pressiirefaotsfas will here-K formed with a circular serie s lof ports 5;. f preferably extend obliquely or spi- Q Tal y so'as to prevent scarring the bushing 5 5 ]vvithin which the body of the valve; "works. i 'Thebody' 1'- 1s also formed with gIQOYQS 0 tween the valve body and the bnshing 9, a

dowel pinor key l dis inserted through the working in the groove or giiideway l2jex- The valve casingB fis forme'dl one end "cess or seat '14 containing an. expansion spring- 15', the free endpff'which bears against the adjacent end of the valvegb ody land has a normal tendency to mo vesaid valve-to. the right infFigu re' 1'. A't1the ";op poslte end of the. valve casing tlie're' is' a steam chamber or ffiuidj pressure; chamb er 16 to which the steam .pmS sh're is fa'd'm'ittedthrongh a pipe 17 as hereinafter descrihed. Theflchar' nber 16' lSQShQWIli as f having a threaded 'connection at"18 with theinain body of thecasing B. '19 designates the'eX- haustjpipe or. connection rromwejete pump of thelocomotive Which delivers .the oil laden s valvefcasing.

.2 The casi ig B "is formed with two annular exhaust or outlet chambers 20 and 21 which communicate through ports in *the inner 'walls"thereof vv'ith'the valve chamber. The.

chamber 20 isin communication iivith apipe 22 which leads to'the steam cylinders. ,The exhaust chamber 21 is in communication with anotherffpipe 23 which leads to the stack. .QThepipe 22' is bifu rcate'dtoform a manifold embodying tivvinf bi'anclie's 2 L which lead to the steam cylinders. Withthe valve in the position shown in Figure 1, the eir'h'aust fsteam fr'omqthe pump passes from teamflf rom the pinnp into the 1 52 Side of the valve thtiol'lgll. the ports 5,

11, andYt into the annu1ar'chamb'er'21 and then through pipe 23' tothe stash. .When the valve A"moves to the right in "Figure 1 it'uncoversthe othenseries of ports 11 in the bushing 9 and'the exhaust steam then passes lllbrrgli. these ports ports :12 into"fih6 cylinder and its other end located in the cab V geeswhenthe.

where it is connected with a source of steam supply, such as the steam I dome X. .The flow of steam from'thedome into the pipe is controlledby a, suitable valve so that the engineer can regulate the flow of steaminto I the pipe. A- check valve 17- is placed in the said pipe X adjacent the cylinder, saidvalve closing toward the cylinder so that it will be open when the mainthrottleisopen and steam is flowing to the cylinders. This valve is closed when the engineers valve in pipe X is open. A -pet cock D-is provided to drain chamber 16. This pet cock and the pipe X and its controlling valve permits steam to pass through .thedevice .to prevent freezing of the water. of condensation in cold-weather, for by opening the pet cock to a limited amount and opening the valve near 'X in pipe X to permit steamfto pass through said pipe and chamber 16, the; parts will be heated. The flow of. steam through the parts is controlled b. the amount of opening of the pet cock and the control valve nearX of pi e X.

The operation of. e device Eas follows When the throttle. is open the pressure from the steamchests, passing through. the .outer 'part of pipe X and pipe 17, andentering the.

. valve chamberthrough the choke plug forces 1 the piston valve to the- .extremelli mit of its travel in its cylindrical casing; as shown in Figure 1. The choke plug. referred to insures the entering of steam pressure at a slow enough rateto prevent severe ramming of the valve, or. the forciblethrowing .ofthe same. against the end of the casing. .The

spring referred to contributes by its cushioning resistanceto the same midi-Therefore, in the normal or running, position, the

exhaust from the airpumppasses .throu h the ports 5, 11 and it; into chamber 21 off e valve and. through pipe 23 to. thesstack.

.VVhen theeggine throttle is shut ofilandthe valve near inpipe closed, therebeing no pressure in front, ofthe valve, the exhaust from the pump forces theqvalveto .the opposite position .or' the limit. of its, traveL-the .t n. In this position of the parts the ports leading to chamber 21 areclosedand those p p .Jeading to chamber,20 are.,opemad, thus I pern one. .e'nd

.m tties; throng helihaustir o ytheifl umptopass Q.

@to the cylinders.

'haust connection lea .ment. thereof.

cylinders. By this means the cooling and lubrication of the cylinders is effected. The opening-of the locomotive throttle valve will force the valve back to its normal position and cause the pump exhaust to pass into the stack. The line check in pipe 22 leading to ithe-steam chest operates to prevent b01181 pressure-. ba up from the steam .chest when the engine throttle is open.

It will thus beseen that the object of the valveisi to divert the pump exhaust from the stack. into. whichtthe exhaust normally as est-thras mam o wtm as e ui pe b-th d v comes to a prolqnged stop vat stationssor el wh a m as r in the steam 'cheste,.aml cylinder. from the exhaust of a a y. w king air warmerr m- 11 m eyli d r a- Bu -br n extent o slow. ,npvth .pnmp. This condition .can ,l e relieved .by

.the engineer 9 M ,the control valve. near X mlpipexandi )forcingthe when back, to. as .mmalp psitioii s that the pump exhaustwilhpassto .thegtack.

It-wfll, thus be seen that theengineer; grim,

by opening thevalve near X in 'pe force. the v.valve. A. to the position. 5 own in F g e its n rm w r that the exhaust from the pump .to

the stack thisgefiect being .thmsame as, when th mthaw a s am t a is p .ing. hr ht h eec finders.

casing ting; time gannularwp utlet. chambers .surrqandmgthehamaaqgznged sideby side and communicating therewi h,a walv'e y monntedifor reciprocatory. moyenwntin said casing, means r.- steam under pre su from th in f e s t inst one end of said valveto shift thesam m one .direction means .for.,autoxnatically ,shi fting the valve in. thei opposite direction in the absenwrof steamflaressure, a pump exing intonne. endIof rsaid valve p ,.an,ontlet;connection leading from one of said:annu lar outlet-chambers .to the stack, and. another outlet connection leadingfrem the other. annular. outletehamber'. to the-steam clmstsof. the engine, said Yalvecontrolling both oftsaid annulanout- .letcha sin 2..A valye, comprisinga valve ha ling two. annular: outlet-chambers sp n'oned asltb se e'w mass ide y sd ja thsm tth, a-ra ,.spring referred to. assisting shchQoperarocatory rno gement imsa d.

pressure:

4 e err V wti ai lii fla .i "Was the .back 1' and forth more.

the pipes. 22. and 24. a; the. steam ing the valve in he opposite directipn in 1 the absence of said steam pressure, a pump let ports from said bore, and the valve casexhaust connection leading into one end of ing having two sets of outlet ports to said said valve casing, an outlet connection leadannular outlet chambers with one set of ing from one of said annular outlet chamwhich the single set of ports of the valve 5 bers to the stack, and another outlet conbody is adapted to register, said valve body 15 nection from the other annular outlet chambeing also adapted to uncover the remaining her to the steam chest of the engine, said set of outlet ports of the valve casing. valve having a central bore to receive the ex- In testimony whereof I aflix my signature. haust from the pump connection and being 10 formed with a single series of lateral out- BENOIST P. GILMAN. 

